fix(ZP-645): PHP 5.4+ ob_start() needs an extra flag to allow truncate.
fix(ZP-645): PHP 5.4+ ob_start() needs an extra flag to allow
truncate.

We need to set flags before calling ob_end_flush, ob_clean...

Signed-off-by: Francisco Miguel Biete <1d85ea0d1a60a438fd84497dece37a4d29dd6409@gmail.com>
<fmbiete@gmail.com>

ekacnet/z-push